What would really happen
Candidate: “Well, if I’m traveling in a car at the speed of light and I turn the headlights on, does anything happen?”
Interviewer: "Yes. Some twat like you puts a photo on Instagram and then tweets some stupid shit. Now take your thumb out of your mouth, piss off back to Costas and make me a coffee, you small-balled embryo."
Interview concluded. Real developer hired later that day.